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NEC Code section Required

A

aelec84

Member
Location
Los Angeles
Occupation
Electrical Engineer
Hello Forum,

Can someone please guide me to the right NEC code section 2020 or 2023 edition for the scenario below?
I have a panelboard rated 100A bus and 100A MCB but total connected/demand load is more than 100A. I am trying to figure out what specific code section is being violated. 220,240? Thank you.
 
dkidd

dkidd

Senior Member
Location
here
Occupation
PE
aelec84 said:
Hello Forum,

Can someone please guide me to the right NEC code section 2020 or 2023 edition for the scenario below?
I have a panelboard rated 100A bus and 100A MCB but total connected/demand load is more than 100A. I am trying to figure out what specific code section is being violated. 220,240? Thank you.
Click to expand...
110.3(A)(7)
 
Dennis Alwon

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
aelec84 said:
Hello Forum,

Can someone please guide me to the right NEC code section 2020 or 2023 edition for the scenario below?
I have a panelboard rated 100A bus and 100A MCB but total connected/demand load is more than 100A. I am trying to figure out what specific code section is being violated. 220,240? Thank you.
Click to expand...


How about this section
408.30 General.
All panelboards shall have a rating not less than the minimum feeder capacity required for the load calculated in accordance with Part III, IV, or V of Article 220, as applicable.
Click to expand...
 
don_resqcapt19

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
aelec84 said:
Hello Forum,

Can someone please guide me to the right NEC code section 2020 or 2023 edition for the scenario below?
I have a panelboard rated 100A bus and 100A MCB but total connected/demand load is more than 100A. I am trying to figure out what specific code section is being violated. 220,240? Thank you.
Click to expand...
Load based on what?
 
J

jaggedben

Senior Member
Location
Northern California
Occupation
Solar and Energy Storage Installer
220.10 is Part II of Article 220. Note the section Dennis cited refers to Parts III, IV and V. Your panelboard is a feeder, not a branch circuit.

So no, you do NOT add up the calculated loads as determined by 220.10 to determine the rating required of the panelboard. It is quite possible, even likely, that there is no code violation.
 
A

aelec84

Member
Location
Los Angeles
Occupation
Electrical Engineer
jaggedben said:
220.10 is Part II of Article 220. Note the section Dennis cited refers to Parts III, IV and V. Your panelboard is a feeder, not a branch circuit.

So no, you do NOT add up the calculated loads as determined by 220.10 to determine the rating required of the panelboard. It is quite possible, even likely, that there is no code violation.
Click to expand...
Understood, thank you. However after applying the demand factors in Part III of 220 if the load is still above rating of the panel then I would think its a code violation.
 
J

jaggedben

Senior Member
Location
Northern California
Occupation
Solar and Energy Storage Installer
aelec84 said:
Understood, thank you. However after applying the demand factors in Part III of 220 if the load is still above rating of the panel then I would think its a code violation.
Click to expand...
Yes, if neither Part IV or V applies. (i.e. it's not a dwelling or a farm, and you have no demand data for 220.87).
 
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